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Q1) The author surveyed students with this request: "Enter your height in inches." Recognize 2 major problems with this request.
Q2) What is wrong with This Picture? Newport Chronicle ran a survey by asking readers to call in their response to this question: "Do you support development of atomic weapons which could kill millions of innocent people?" It was reported that 20 readers responded and 87% said "no" while 13% said "yes." Recognize 4 major flaws in this survey.
Q3) Train Derailments: The analysis of 50 train derailment incidents recognized main causes given below, where T denotes bad track, E denoted faulty equipment, H denotes human error, and O denotes other causes (based on data from the Federal Railroad Administration). Create table summarizing frequency distribution of these causes of train derailments.
T T T E E H H H H H O O H H H E E T T T E T H O T
T T T T T T H T T H E E T T E E T T T H T T O O O
In what height interval must the company expect to determine middle 70% of kindergarteners?
Research question: Are mean crash damages same for these 3 vehicles? Crash1 Crash Damage ($).
Using six-step critical value approach, at the 0.05 level of significance, is there evidence that population mean delivery time has been increased below previous population mean value of 25 minutes?
Probability histogran curve of percentage of (P)z
The main purpose of this exercise is to check your understanding of significance level, p-values and power .
The lengths of pins produced by a machine follow a normal distribution with mean 2.54 cm and standard derivation 0.04 cm.
Find out sample correlation coefficients of (I) age with dry weight, and (2) age with log 10 dry weight. Interpret your results.
The standard deviation of the population of adult female height scores is 3 inches. A random sample of 50 women yields a mean height of 64 inches. Calculate the standard error of the mean.
Your statistics instructor wants you to determine a confidence interval estimate for the mean test score for the next exam.
When a sample mean is greater than the true, population mean, the resulting difference is called:
First explain what the Gini coefficient is and what hypothetical Gini values of 0 and 1 mean. Sort the data by the Gini coefficient in 2000 and look at the list of countries.
Construct the 90% and 95% interval estimates for the population mean weekly sales.
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